I don't know what the circumstances are, but let's reframe the situation:
Your best friend marries a woman and becomes dependent upon her. She ends up abusing him regularly. After 20 years of abuse, he finally manages to get counseling and safe-house resources to escape the abusive home environment and the abusive spouse. He manages to get a divorce.
A few months later, another friend of yours from another circle of friends tells you about this amazing woman that he's met. To your surprise, you learn it is the same woman, your other friends abusive x wife.
Do you wish them all the best in their new relationship with a person you know is an abuser, or do you bring to their attention the persons history of abuse?
In other words, why hand deliver children to known criminals?